Accession Number:

ADA234939

Title:

Mechanical Properties of Polycarbonate-Polysulfone and Polycarbonate- Polyetherimide Blends

Descriptive Note:

Final rept. Oct 1987-Sep 1990

Corporate Author:

ARMY NATICK RESEARCH DEVELOPMENT AND ENGINEERING CENTER MA

Personal Author(s):

Report Date:

1991-04-01

Pagination or Media Count:

30.0

Abstract:

This project is an attempt to produce a ballistic impact resistant transparent eye armor with improved scratch and chemical resistance over polycarbonate. The first stage of the project examines the thermal and mechanical properties of the polymers. Five, ten, and twenty percent by weight blends of polysulfone in polycarbonate and polyetherimide in polycarbonate were produced by melt blending using a counter-rotating twin screw extruder at 320C. The materials were injected molded into plaques 11.4 cm square by 3.2 mm and 1.6 mm thick. Mechanical analysis consisting of tensile, pendulum impact, and ballistic impact testing was conducted using the plaques or samples machined from the plaques. Dynamic mechanical testing was performed using bars machined from the 32 mm plaques to observe the low temperature loss peak and determine the activation energy of the loss mechanism. Differential scanning calorimetry was conducted to measure the glass transition temperatures of the material. The presence of two glass transition temperatures and lack of transparency have indicated that the blends are immiscible. Both sets of blends exhibit fair to good ballistic impact properties up to at least 20 polysulfone or polyetherimide. The tensile data of the blends show an increase in tensile strength over the same range.

Subject Categories:

  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE